The bulk update request #11116 is pending approval.

create implication muffled_speech (628) -> muffled (4370)
create implication muffled_screaming (303) -> muffled (4370)
create implication muffled_moaning (290) -> muffled (4370)
create implication muffled_sounds (31) -> muffled (4370)
create alias muffled_scream (44) -> muffled_screaming (303)

Reason: All these categories can be gathered under "muffled".